jovial_cynic Posted September 29, 2008 Report Share Posted September 29, 2008 I believe that I've got a flat-spot on my 6-bolt flywheel; I've swapped out the starter, thinking that it might have been free-spinning because the shaft didn't kick out, but after swapping it out, I'm pretty sure that the flywheel is the problem. Has anybody re-rung their flywheel, or do they just grab another one? Are all 6-bolt flywheels the same for Datsuns? 280z flywheel work? Quote Link to comment
datzenmike Posted September 29, 2008 Report Share Posted September 29, 2008 All 6 bolt L and Z will interchange but some are different weights. I have seen a 29 and a 21 lb 225mm wheel. Identical otherwise. Quote Link to comment
jovial_cynic Posted September 29, 2008 Author Report Share Posted September 29, 2008 Interesting. Any thoughts about the aluminum 10lb 6-bolt flywheels that are on eBay? Quote Link to comment
jovial_cynic Posted September 29, 2008 Author Report Share Posted September 29, 2008 wait wait. That can't be accurate. I had two 6-bolt flywheels, and only one of them mated correctly to the roadster pressure plate that I bought. Quote Link to comment
slodat Posted September 29, 2008 Report Share Posted September 29, 2008 The pressure plate mounting hole bolt circle is 200mm on the roadster clutch and 225 on the Z/620 clutch. Quote Link to comment
jovial_cynic Posted September 29, 2008 Author Report Share Posted September 29, 2008 So... which flywheels work? From what vehicles? My flywheels both came from boxes of misc. datsun parts, so I don't know where they came from. If I'm going to hunt for a flywheel that'll mate up to the roadster clutch, which flywheel do I need? (aside from the seemingly obvious roadster flywheel). Quote Link to comment
datzenmike Posted September 29, 2008 Report Share Posted September 29, 2008 Sorry, they will all interchange and physically bolt up to any L/Z motor. As for clutches, only cars with the matching 200mm clutch/flywheel are the '80-'81 200sx with the Z20E motor (possibly the '82-'83 with the Z22E) and any other L20B powered car. All 620/720 trucks are either 225mm or 240mm. Quote Link to comment
hang_510 Posted September 29, 2008 Report Share Posted September 29, 2008 which flywheel do I need? (aside from the seemingly obvious roadster flywheel). ... the matching 200mm clutch/flywheel. match the FW to the PP(roadster=200mm) Quote Link to comment
jovial_cynic Posted September 30, 2008 Author Report Share Posted September 30, 2008 thanks. i guess it's time to go parts fishing again. Quote Link to comment
jovial_cynic Posted September 30, 2008 Author Report Share Posted September 30, 2008 In the event that I can't find another good flywheel any time soon, is this a reasonable option? Has anybody ever re-rung a flywheel before? http://cgi.ebay.com/ebaymotors/Datsun-Fairlady-Roadster-Flywheel-Ring-Gear_W0QQitemZ280201823156QQcmdZViewItem?_trksid=p4506.m20.l1116 It's the roadster flywheel ring-gear. It seems that it's the minimal approach to getting what I need done. Any clues on what it costs to get a flywheel re-rung? Quote Link to comment
datzenmike Posted September 30, 2008 Report Share Posted September 30, 2008 I have my doubts as to weather the roadster flywheel or starter ring will fit an L or Z flywheel. As far as I know the only thing in common is the 200mm pressure plate and clutch assy. The old ring can be cut with a saw and removed. To put the new one on, cool the flywheel in the freezer while heating the ring in a 400 degree oven. Quickly place the hot ring over the cold flywheel and tap quickly into place. Quote Link to comment
jovial_cynic Posted September 30, 2008 Author Report Share Posted September 30, 2008 Didn't the roadster fairlady have the L16 and L20 in it? Quote Link to comment
ppeters914 Posted September 30, 2008 Report Share Posted September 30, 2008 Didn't the roadster fairlady have the L16 and L20 in it? Nope. R16 (pushrod) and U20 (SOHC). Quote Link to comment
jovial_cynic Posted September 30, 2008 Author Report Share Posted September 30, 2008 ah. Good to know. So... this is the right ring-gear, correct? http://cgi.ebay.com/ebaymotors/FRG634-Ring-Gear-Nissan-75-77-78-79-80-81-82-83-84-85_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el1116QQitemZ310004939316 Quote Link to comment
banzai510(hainz) Posted October 17, 2008 Report Share Posted October 17, 2008 YOu have a 200 mm 6 bolt from a car. like a 77-79 200sx and any maybe 610s and 710 that had L20 in there.Truck L20s use the bigger 225mm or maybe a 240mm I believe Napa, Rockauto or maybe others might have new ring gears if you think its bad and a machine shop will put it on. So you can sgtill use you roadster set up or maybe Ted has one in Yelm. Fidanza has aluminum ones for about 380$ Quote Link to comment
datzenmike Posted October 18, 2008 Report Share Posted October 18, 2008 You can replace the ring gear at home. Place the flywheel in the freezer and heat the ring gear in the oven (with your wife's permission) at 350-425 degrees. Quickly slip the hot gear over the cold flywheel and tap into place... easy. To remove the old damaged one just grind away metal until it splits. Quote Link to comment
jovial_cynic Posted October 18, 2008 Author Report Share Posted October 18, 2008 thanks, folks. I've got a new ring gear now, and a near future plan is to swap it on. Quote Link to comment
datzenmike Posted October 19, 2008 Report Share Posted October 19, 2008 My FSMs all say when working with the flywheel never to drop it. I always thought... Duh. But they never say this about equally heavy parts like the crank or head. Dropping could cause the flywheel to flex like a rubber ball and the ring could pop off. Quote Link to comment
jovial_cynic Posted October 21, 2008 Author Report Share Posted October 21, 2008 Old flywheel ring gear. New flywheel ring gear. Old flywheel ring gear. New flywheel ring gear. Holy smokes, that old ring gear has seen better days. I should get the one new pressed on in the next day or so. Quote Link to comment
ppeters914 Posted October 21, 2008 Report Share Posted October 21, 2008 Holy smokes, that old ring gear has seen better days. I should get the one new pressed on in the next day or so. T'would appear to be a good idea. :D Quote Link to comment
jovial_cynic Posted October 22, 2008 Author Report Share Posted October 22, 2008 Based on the way the ring gear sits against the flywheel, there will be no hack-sawing of the old ring gear -- there's no way for the hacksaw to go across the ring gear without cutting into the flywheel itself. I've read that using a torch and a metal chisel is an alternative solution. I've got a torch. I've got a chisel... As for a new starter, any thoughts to the value of a reduction gear starter? The stock compression ratio on the L16 is something like 8.6:1. Mine is upwards of 9.58:1. Is that so high that a reduction gear starter is a good option? Or will the stock starter suffice? Quote Link to comment
slodat Posted October 22, 2008 Report Share Posted October 22, 2008 I have the Z car gear reduction starter on my car. I like it. Quote Link to comment
mklotz70 Posted October 22, 2008 Report Share Posted October 22, 2008 If you're looking to split the old gear off.....can you drill an 1/8" hole or two across the width of the gear....that would make splitting it much easier. Quote Link to comment
jovial_cynic Posted October 22, 2008 Author Report Share Posted October 22, 2008 mklotz70 - that's what I had in mind. :) The less metal I have to chisel through, the better. Quote Link to comment
Farmer Joe Posted October 22, 2008 Report Share Posted October 22, 2008 All 6 bolt L and Z will interchange but some are different weights. I have seen a 29 and a 21 lb 225mm wheel. Identical otherwise. sorry to hijack, but thats absolutely true? i can put an Z24 flywheel on an L20? if so then i dont have to worry about gettin the last L series flywheel at the yard. Quote Link to comment
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